Syringe



L MACGREGOR.

SYRINGE.

APPLICAUON FILED APR.2,1918.

1,33 1,271 Patented Feb. 17, 1920.

JOHN MACGREGOR, GF ROSLNELE, llA.

SSLCHUSETTS, ASSIGNOR TO MACGREGOR INSTRUMENT COMPANY, A. CORPRATIGIST OF MASSACHUSETTS.

SYRINGE.

Application filed April 2,

To @ZZ whom it may concern:

Be it known that I, JOHN MACGREGOR, citizen of the United States, and resident of Roslindale7 State of lilassachusettsJ have invented an Improvement in Syringes7 of which the following is a specification.

The object of my invention is to provide a construction of syringe suitable for irrigating or flushing Vthe gums of teeth, more especially where they are aected with pyorrhea or other diseases injurious to the health of the gums.

My invention is more particularly directed to the form or construction of the canula or nozzle for conveniently conveying and vproperly distributing' the iluid to the gums under the action of the syringe plunger; and further comprehends a canula of uniform diameter extending at an angle from the axis of the cylinder of the syringe and terminating in a double aperture formed by iiattening the end of the canula and bringing the diametrically opposite walls into contact at a medial point.

My improvements also provide the union between the metal canula land glass nipple of the syringe body, by having the glass fused about the inserted end of the canula and pressed into intimate contact and thereby shrunk thereon to provide a liquid tight connection of a permanent character.

My invention also consists of improvements hereinafter described whereby the above objects and results are attained, said improvements comprising certain organization and combination of parts which are fully described hereinafter and more particularly defined in the claims.

Referring to the drawings: Figure l is an elevation of a syringe embodying my invention, with part in section; Fig. 2 is a perspective view of the canula and end of the syringe body; and Fig. 3 is a sectional view of the upper jaw showing the application of my improved syringe to the gums.

2 is the syringe body and is formed oi' glass with the bore ground to accurate diameter. 3 is the plunger for the syringe body and is ground to make a fluid tight though movable sliding joint. The general construction of the body and plunger shown is that which is in general use and will need no further description. 7 is the canula of metal, the orifice through it being of uniform size and through which the liuid from Specification of Letters Patent.

Patented Feb. 17, 1920.

1918. Serial No. 226,158.

the syringe body may freely flow. This canula 7 is bent at 15 to provide a short length G which extends into and is held by the nipple 5 of glass formed as an extension of the body 2 at its discharge end 4:. On the inside ol1 the nipple there is a conical aperture 8 for directing the fluid content of the body into the receiving end 6 of the canula. This end ot' the canula is held in place in the glass nipple 5 by the latter being fused and molded under pressure to fit tightly about the canula as will be under` stood by reference to Fig. l. The long eX- tended portion 7 of the canula is bent at an angle to the axis of the syringe body 2 so as to extend to one side of the body 2 and be adapted for easy and satisfactory application to the gums, a capacity which could not be secured with a short straight canula.

By reference to Fig. 2 it will be seen that the discharge end 9 of the canula 7 is flattened and the opposite middle portions of the flattened sides are pressed together at l0 to provide the two ducts or discharge apertures 11 and 12 which divide the fluid passing through the canula into two parts for the purpose of spreading the discharge and at the same time restricting the escape to an extent sufficient to retard the discharge. Moreover, the discharge from the two orii'ices 11 and 12 is slightly divergent and hence will more fully flush the gums. The shape of the nozzle end 9 is such that its greatest width may be pressed against the gums transversely to the length ci the teeth, or be held with the two apertures 11 and 12 in a vertical line and between the teeth, to suit the conditions of the gums.

In hypodermic syringes as commonly made, the needles are detachably clamped -npon the nozzle end of the syringe so that the needles may be removed and replaced, but the constructions thus in common use are costly and wholly unnecessary for the purposes of my invention. By my construction the canula is cheaply made, effective in fluid distribution, and secured to the glass nipple of the syringe body in a permanent manner, and by a joint which is both strong 'and liquid tight.

It will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as desirable, and While I have in the present instance shown and described the preferred embodiment thereof which Vhas been found in practice to give satisfactory and reliable'results, it is'to be understood that I do notres'trictniyself tothe details, as the same are susceptible of modification in various particulars Without departing from thev spiritl or `scope of the invention.

'Having now described my invention what I claim as nev7 and desire .to secure-.by Letters Patent, is: I

11. AAsyringe for treating vthevg'ums, coni- -pr-islin'g a syringe body provided with a foanula having fits discharge endffflattened andy thev side Walls thereof'pressed into contact at an intermediate point to! provide two 'clearly defined discharge apertures to prol-du'cetvvo divergingstreams.

- l 12. vA syringe lfor treating the 'gums, comprising syringe body loflglas's provided with a metal canula yopening through the -endjof 'the body-fand'secured in place-by hav- -unto set my hand.

ing the glass thereofshrunli` upon the in-`Y closed end of the canulaand the free nend 0f the canula bent .in Jan oblique direeti'on to 4the syringe bo'dyan'd" terminating in a pluv.rality of nozzle apertures. Y

3. A syringe for treating the gums, coin- 4. prisng a` syringe -body having Aaglasrsrnipple arranged at the dischargeY endv and 'an angularly shaped `eanula of metal having one end extending through the glassnipple and held lin place by the glassbeing lshrunk Athereon and `said @anula and its extended Vend `projecting to-'one 'side-ofrthebody and "having its rend vliattene'd to 'for-m a nozzle portion. 4

In testimony Vof `which y invention,V Iherey `j j JoHN fMA'CGREeoR.

Witness: A :ANN-A J. Harri-ini. 

